database design with erd tools visual paradigm design database with entity relationship diagram tool erd tool create conceptual logical and physical database design generate database and ddl from erd and more library management system database design free student this page contains information of library management system database design the database is a collection of information and is systematically stored best er diagram tool visual paradigm what is the best er diagram tool entity relationship diagram is a snapshot of data structure such a database design diagram is used to show the entities present in a database as well as the relationship between tables in that database typically used for modeling the organization of data within databases or information systems